Box-tool.



W. GRANDALL.

' BOX TOOL.

A APPLIATION FILED NOV. l5,- 1912. 1,085,800. Patented Feb;3-, 1914.

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W. CRANDALL.

BOX TOOL.

' APPLICATION FILED Nov.15, 1912.

Patented Feb. 3, 1914.

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N TEI) STATES PATENT OFFICE.

WILLIAM CRANDALL, 0F CLEVELAND, OHIO, ASSIGNOR TO THE NATIONAL-ACMEMANUFACTURING COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

BOX-TOOL.

Specification of Letters Patent. j

Application led November 15, 1912. Serial No. 731,488.

from the work so that when the tool moves away from the work it will notscore or mark the same, but leave the work with a clean cut.

In the drawings accompanying and form-i ing part of this specificationFigure 1 is a top view of this improved box tool; Fig. 2 is an end viewthereof; Fig. 3 is a diagrammatic view illustrating in full lines theposition of the tool when at work and in dotted lines the position ofthe tool when free of the work; Figs. 1 and 5 are detail viewsillustrating the supports for the tools; and Fig. 6 is a viewillustrating the end working tool and its means of adjustment.

Similar characters of reference indicate corresponding parts throughoutthe figures of the drawings.

The box tool comprises the usual holder 2 having a shank 3 forattachment to the turret head or other means of support, the usual stockor work engaging rolls 4 and 5, the holder being bored as at 6 in theusual manner. Carried at one side of the bore of this holder is the toolsupport comprising in the present instance a compound slide 7, onemember or block, as 8, of which is supported for vertical adjustment ona lateral projection 9 of the holder 2. This projection is provided witha perpendicularly disposed slide-way 10 for the reception of a tongue 11of such slide 8. This projection 9 is provided with an elongated slot 12through which extends a threaded rod 13 carrying a clamping nut 14C atits end. For vertically adjusting this slide 8 to thereby set the toolfor different sizes of work it is provided at one side of its slide-waywith a curved recess into which fits the edge of an adjustable washer 15which is adjusted up and down by means of a screw 16 extending into anopening in the projection 9. Supported by the slide 8 is another slidemember or `block 17 which carries the tool or blade 18. This slide 17 isprovided with an inclined slideway 19 adapted to t an inclined tongue 2Ocarried by the slide member 8. This tongue and slide-way, 2O and 19,extend upwardly as it were from the outer to the inner ends adjacent tothe bore of the tool holder. The sliding member 17 is provided with atool receiving opening 21 located at an angle or inclined to the axis ofthe tool holder so that the tool will be supported in such position asto bring its outer end in position adjacent to the work or stocksupporting rolls hereinbefore mentioned. The tool is secured in positionby means of an adjustable clamping screw 22. For securing the slidemember 17 to the slide member 8 a headed screw 23 projects into ashouldered or countersunk smooth bored opening 24 of the slide member17, the threaded end of said screw extending into the threaded opening25 of the slide member 8. The diameter of this screw or bolt 23 is lessthan that of its opening 211, so that the slide block 17 can have asliding back and forth movement by reason of the slide-way between thisblock and its companion block 8. Located at right angles to the opening24 is an opening 26 in which is located a spring pressed plunger 27 inposition to engage the side of the screw bolt 23. For adjusting theslide member 17 relatively to this bolt an adjustable screw 28 extendsthrough a threaded opening into engagement with the bolt at the otherside thereof opposite to the location of the spring pressed plunger.This plunger is located at the forward side of the bolt 23, that is tosay at that side thereof nearest to the cutting end of the tool.

In the present instance the tool is so oarried that it will make what isknown as an over-cut, being set to cut on the center of the face of thework, and as hereinbefore stated is located at an angle by reason of theangular location of the tool receiving opening. The tendency of thespring plunger hereinbefore referred to is to lift or hold the tool upslightly from the work by reason of its engagement with the bolt 23, inother words the tendency of the spring, by reason of such engagement.with the bolt 23, is to move the slide 17 toward the work, thuscarrying the tool forward beyond the center of the work, as shown by thedotted lines a, F ig. 3.

ln practice the cutting tool is set a little ahead of the center of thework as shown at ai, Fig. 3. In consequence, when the work is rotated itengages the end of the tool, and by reason of the spring plungerhereinbefore described the tool and its slide block 17 are forced backon its slide way and therefore downwardly, by reason of the inclinationof such slide-way, and thus the tool is forced back into -a positionwhere it is on the center, as at Z) 7, Fig. `3, so thatthe tool willmake a shearing' over-cut on the center of the work. 'Vhen the stock hasbeen cutdown from c to d and the entire chip or'chips removed so as toleave the stock of the diameter shown at d, Fig. 3, the spring' willforce the tool block 17 and thereby the tool forward and leave it, byreason of the inclined slide-way, in the position shown at a dottedlines, thus lifting it from the `finished piece so that the tool can bebacked oif without scoring or marking or injuring or otherwise mutilat*ing the work.

From the foregoing it will be thus observed that the tool is supportedfor shiftable movement relatively to the tool holder, so that when thechip has been completely taken from the work the tool will bealitomatically lifted and shifted slightly forward of the center of thework, so that it will be free of the work, the work itself constantlyholding the tool back into its pro-per center cutting position throughthe medium of the inclined slide-way. Thus it will be observed that thestrain of the cutting maintains the tool in its proper center positionand that as soon as the strain is off the tool the to-ol immediatelyshifts forward by reason of the spring so as to clear the work. Theamount that the tool is set beyond the center depends on the differenceor clear'- ance between the diameter of the screw bolt 23 and thediameter of its opening 24. It will also be observed that in the presentconstruction the tool recedes backward to its cutting position, and theblock which carries it is supported throughout practically the entirelength of that block, so that 'there is no opportunity for the tool tovibrate, while at the same time by reason of such support a heavier cutmay be made by the tool, which would not be the case if the block vasonly supported by a pivot remote from the cutting point. In the presentimprovement the box tool holder also carries an end cutting' tool 30which is supported for adjustment toward and from the work by means of aslide block 3l having an clon gated slot 32 therein for the passage of aclamping screw 33, this slide block being carried in a recessed portion34 of the hol der and is provided at its tool supporting end with anangular recess 35 opening at one side of the block 3l. One side of thisangular recess is cut away to form an inclined wall 36 and locatedtherein is a wedgeshaped member 37, the straight edge of which 3S is inposition to engage one side of the tool 39. An adjusting screw passesthrough the holder 3l and into the wedgeshaped member37 whereby onadjusting this screw downwardly the wedge-shaped portion or block 37 is`drawn up and so more hrmly holds the tool in its slot.

I clai-m as my invention l. A box tool holder having a blade supportedto make an over-cut on the center, and means including an inclinedlysupported part for automatically lifting and moving it forward from thework when the cutting operation is completed.

2. A boX tool holder having a cutting blade supported to make anover-cut on the center, and means including an inolinedly supportedvpart for maintaining the working end set beyond the center andeffective to permit the work to move the tool backward to its cuttingposition to'center it.

3. A box tool holder having a cutting blade, a slide for supporting it,one of said parts being carried by an inclined part and means for movingsaid slide to project the cutting edge of the tool beyond the center ofthe work and effective to permit the movement of the tool and its slideto center the tool when in engagement with the work.

l. A box tool holder having a blade supported `to make an over-cut onthe center, and means for automatically lifting it from the work whenthe cutting operation is completed, and including a tool supportingblock, an inclined slide-way, and a spring.

A box tool holder having a blade supported to make and over-cut on thecenter, and mea-ns for automatically lifting it from the work when thecutting operation is coinpleted, and including a compound slide havingan inclined slide-way and a spring.

6. A box tool holder having a blade supported to make an over-cut on thecenter, and means for automatically lifting it from the work when thecutting operation is co1npleted, and including a compound slide havingan inclined slide-way, a bolt connecting the members of said compoundslide and having less diameter than the opening for said bolt, and aspring carried by one of the members of said compound slide to engagesaid bolt.

7 A box tool holder having a cutting blade, a compound slide forsupporting it, means for adjusting said slide according to the size ofthe work, said compound slide having between the members thereof aninclined slide-way, a threaded bolt connecting' the members of saidcompound slide and having less diameter than the opening therefor,through one of the members of said` compound slide, and resilient meanscarried by one of the members of said compound slide for engaging saidbolt whereby the cutting end of the tool will be projected beyond thecenter of the work and whereby the work will center the tool when inengagement with the work.`

8. A box tool holder having a cutting blade supported to make anover-cut on the center, and means for supporting said blade andcomprising a compound slide, means for adjusting said Slide according tothe size of the work, said compound slide having an inclined slide-waybetween the members thereof and inclined upwardly toward the end of thecutting tool, the outer slidey member having an angular opening .for thereception of the cutting blade, means connecting said slide members, andmeans carried by the outer slide member and. in engagement with saidconnecting means for permitting the movement of the blade and itssupporting member relatively to the work.

9. A box tool holder having a cutting blade, and means for supportingsaid blade and automatically operative to lift the blade from the workwhen the cutting operation is completed and effective to permit the toolto recede to its cutting position, and an inclined way for supportingone of said parts.

10. A box tool holder having a cutting blade, and means for supportingsaid blade and automatically operative to lift the blade from the workwhen the cutting operation is completed, and including a supportingblock movable in an inclined plane relatively to the axis of the work.

11. A box tool holder having a cutting blade, and means for supportingsaid blade and automatically operative to lift the blade from the workwhen the cutting operation is completed, and including a supportingblock movable in an inclined plane relatively to the axis of the work,and means for pressing said block toward the work.

l2. A box tool holder having a blade, means for supporting it andcomprising a block movable in an inclined plane relatively to the axisof the work, and means for shifting said block toward the work.

13. A box tool holder having a blade, means for supporting it andcomprising a block movable in an inclined plane relatively to the axisof the work, and means for shifting said block toward the work andcomprising a spring pressed plunger carried by the block and a fasteningdevice pro jecting through the block for engagement with said plungerand having less diameter than the opening in said block.

14. A box tool holder having a blade, means for supporting it andcomprising a block movable in an inclined plane relatively to the axisof the work, means for shifting said block toward the work andcomprising a spring pressed plunger c-arried by the block, a fasteningdevice projecting through the block for engagement with said plunger andhaving less diameter than the opening in said block, and means foradjusting the block relatively to said fastening device.

15. A box tool holder having a blade supported to make an overcut on thecenter, and means for supporting said tool and effective to permit it torecede to its cutting position, one of said parts being carried by aninclined part.

16. A box tool holder having a blade supported to make an overcut on thecenter, and means including a sliding block for carrying said tool, andeffective to permit the tool to recede to its cutting position.

17. A box tool holder having a blade supported to make an overcut on thecenter, and sliding means for supporting said tool and effective topermit it to move forward and upward from its cutting position, and torecede backward and downward to its cutting position.

18. A box tool holder having a blade supported to make an overcut on thecenter, and means for supporting said tool and effective to permit it tomove forward and upward from its cutting position, and to recedebackward and downward to its cutting position, said supporting meansincluding a movable block supported at various points along the samethroughout the various positions of the tool.

19. A box tool holder having a blade supported to make an overcut on thecenter and means for supporting said tool, and including a movable meanshaving a continuous point of support throughout. substantially itsentire length, and effective to permit the tool to recede to its cuttingposition.

ILLIAM CRANDALL.

Vitnesses PAUL E. RYAN, Oso-lu A. SMITH.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents,

Washington, D. G.

